Service manual

AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 5
Process Section Composition and Applying Voltage
Composition of process section
30
-500V
(-470)
200M
200M
25µA (45ppm)
19µA
(31/35ppm)
-1.8KV
MAX 5KV
Paper dust cleaner
Separation electrode
MAX 8KV
constant current
-650V
(-620V)
Temperature/humidity sensor
opc27 m
ctc27 m
-800V
Toner density sensor
14 14
8
7
1
9
6
2
4
3
13
12
11 10
16
15
5
1 Laser beam Forms latent electrostatic images on the photoconductor drum. (Writing resolution: 600dpi)
The output from LSU can be set with the simulation. (Basically the initial setup is used.)
2 Photoconductor drum Latent electrostatic images are formed on the photoconductor drum. It attracts toner to the
electrostatic images and transfers them to paper. An OPC drum of 30mm diameter is employed.
3 Main charger Applies a high voltage to charge the OPC drum. Of saw teeth type.
4 Screen grid Charges electric charges generated from the main charger to the OPC drum evenly. -650V, 35cpm
Copy, -620V only for AE.
5 MG roller Forms a magnetic brush with developer and puts toner on the OPC drum. -500V, 35cpm
Copy, -470V only for AE.
6 Developing doctor Keeps the thickness of developer and toner (magnetic brush) on the MG roller at a constant level.
7 Toner quantity sensor Detects the quantity of toner in the developing unit. A magnetic sensor of transmission type is
employed.
8 Temperature/humidity sensor The temperature and the humidity inside the machine are detected, and process control is
performed according to the detected temperature and humidity.
9 CRUM-IC Toner cartridge conditions (destination, toner motor rotating time, empty, near empty, etc.)
10 Transfer roller Applies a voltage to transfer toner on the OPC drum to paper.
11 Separation electrode The electrode to separate paper from the OPC drum by the potential difference.
12 Drum separation pawl The pawl to separate paper from the OPC drum mechanically.
13 Cleaning blade Made of silicon rubber. Removes remaining toner from the OPC drum. Always in contact with the
drum.
14 High voltage resistor PWB Prevents a high voltage from leaking through the paper guide at a high humidity. 200MΩ each.
15 Resist roller Bends paper to adjust the paper feed timing to the process section.
16 Paper dust cleaner Removes paper dust from the resist roller to reduce mixing of paper dusts into the process section.